Description

These functions evaluate the complex function log(z) for an entire vector of
values at once. The first parameter specifies the number of values to
compute. Subsequent parameters specify the argument and result vectors. Each vector is
described by a pointer to the first element and a stride, which is
the increment between successive elements.

These functions are not guaranteed to deliver results that are identical to
the results of the clog(3M) functions given the same arguments.

Usage

The element count *n must be greater than zero. The strides for
the argument and result arrays can be arbitrary integers, but the arrays
themselves must not be the same or overlap. A zero stride effectively
collapses an entire vector into a single element. A negative stride causes a
vector to be accessed in descending memory order, but note that the
corresponding pointer must still point to the first element of the vector
to be used; if the stride is negative, this will be the
highest-addressed element in memory. This convention differs from the Level 1 BLAS, in
which array parameters always refer to the lowest-addressed element in memory even
when negative increments are used.

These functions assume that the default round-to-nearest rounding direction mode is in
effect. On x86, these functions also assume that the default round-to-64-bit rounding
precision mode is in effect. The result of calling a vector function
with a non-default rounding mode in effect is undefined.

Unlike the c99 clog(3M) functions, the vector complex exponential functions make no
attempt to handle special cases and exceptions; they simply use textbook formulas to
compute a complex exponential in terms of real elementary functions. As a
result, these functions can raise different exceptions and/or deliver different results from
clog().